djb proposed Internet Mail 2000 back in the early 2000s as an attempt to solve this kind of problem without micropayments[1]. As others have said, a lot of the

djb proposed Internet Mail 2000 back in the early 2000s as an attempt to solve this kind of problem without micropayments[1]. As others have said, a lot of the useful emails I get are still ones where the sender probably wouldn't have paid to send them. IM2000's fairly old-school-yet-elegant approach would probably lead to a better outcome too. [1]: http://cr.yp.to/im2000.html http://cr.yp.to/im2000.html